#!/bin/bash
#
# Copyright (c) 2014 Anand Subramanian anands@redhat.com
# Copyright (c) 2015 Red Hat Inc.
#                    All Rights Reserved.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of version 2 of the GNU General Public License as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it would be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
#
# Further, this software is distributed without any warranty that it is
# free of the rightful claim of any third person regarding infringement
# or the like.  Any license provided herein, whether implied or
# otherwise, applies only to this software file.  Patent licenses, if
# any, provided herein do not apply to combinations of this program with
# other software, or any other product whatsoever.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write the Free Software Foundation,
# Inc., 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
#
#

# Initialization:
: ${OCF_FUNCTIONS_DIR=${OCF_ROOT}/lib/heartbeat}
. ${OCF_FUNCTIONS_DIR}/ocf-shellfuncs

if [ -n "$OCF_DEBUG_LIBRARY" ]; then
	. $OCF_DEBUG_LIBRARY
else
	: ${OCF_FUNCTIONS_DIR=${OCF_ROOT}/lib/heartbeat}
	. ${OCF_FUNCTIONS_DIR}/ocf-shellfuncs
fi

OCF_RESKEY_grace_active_default="grace-active"
: ${OCF_RESKEY_grace_active=${OCF_RESKEY_grace_active_default}}

ganesha_meta_data() {
	cat <<END
<?xml version="1.0"?>
<!DOCTYPE resource-agent SYSTEM "ra-api-1.dtd">
<resource-agent name="ganesha_grace">
<version>1.0</version>

<longdesc lang="en">
This Linux-specific resource agent acts as a dummy
resource agent for nfs-ganesha.
</longdesc>

<shortdesc lang="en">Manages the user-space nfs-ganesha NFS server</shortdesc>

<parameters>
<parameter name="grace_active">
<longdesc lang="en">NFS-Ganesha grace active attribute</longdesc>
<shortdesc lang="en">NFS-Ganesha grace active attribute</shortdesc>
<content type="string" default="grace-active" />
</parameter>
</parameters>

<actions>
<action name="start"   timeout="40s" />
<action name="stop"    timeout="40s" />
<action name="status"  timeout="20s" interval="60s" />
<action name="monitor" depth="0" timeout="10s" interval="5s" />
<action name="notify"  timeout="10s" />
<action name="meta-data"  timeout="20s" />
</actions>
</resource-agent>
END

return ${OCF_SUCCESS}
}

ganesha_grace_usage() {
	echo "ganesha.nfsd USAGE"
}

# Make sure meta-data and usage always succeed
case $__OCF_ACTION in
	meta-data)	ganesha_meta_data
			exit ${OCF_SUCCESS}
			;;
	usage|help)	ganesha_usage
			exit ${OCF_SUCCESS}
			;;
	*)
			;;
esac

ganesha_grace_start()
{
	local rc=${OCF_ERR_GENERIC}
	local host=$(hostname -s)

	ocf_log debug "ganesha_grace_start()"
	# give ganesha_mon RA a chance to set the crm_attr first
	# I mislike the sleep, but it's not clear that looping
	# with a small sleep is necessarily better
	# start has a 40sec timeout, so a 5sec sleep here is okay
        sleep 5
	attr=$(crm_attribute --query --node=${host} --name=${OCF_RESKEY_grace_active} 2> /dev/null)
        if [ $? -ne 0 ]; then
		host=$(hostname)
		attr=$(crm_attribute --query --node=${host} --name=${OCF_RESKEY_grace_active} 2> /dev/null )
                if [ $? -ne 0 ]; then
	                ocf_log info "grace start: crm_attribute --query --node=${host} --name=${OCF_RESKEY_grace_active} failed"
                fi
        fi

	# Three possibilities:
	# 1. There is no attribute at all and attr_updater returns
	#    a zero length string. This happens when
	#    ganesha_mon::monitor hasn't run at least once to set
	#    the attribute. The assumption here is that the system
	#    is coming up. We pretend, for now, that the node is
	#    healthy, to allow the system to continue coming up.
	#    It will cure itself in a few seconds
	# 2. There is an attribute, and it has the value "1"; this
	#    node is healthy.
	# 3. There is an attribute, but it has no value or the value
	#    "0"; this node is not healthy.

	# case 1
	if [[ -z "${attr}" ]]; then
		return ${OCF_SUCCESS}
	fi

	# case 2
	if [[ "${attr}" = *"value=1" ]]; then
		return ${OCF_SUCCESS}
	fi

	# case 3
	return ${OCF_NOT_RUNNING}
}

ganesha_grace_stop()
{

	ocf_log debug "ganesha_grace_stop()"
	return ${OCF_SUCCESS}
}

ganesha_grace_notify()
{
        # since this is a clone RA we should only ever see pre-start
        # or post-stop
	mode="${OCF_RESKEY_CRM_meta_notify_type}-${OCF_RESKEY_CRM_meta_notify_operation}"
	case "${mode}" in
	pre-start | post-stop)
		dbus-send --print-reply --system --dest=org.ganesha.nfsd /org/ganesha/nfsd/admin org.ganesha.nfsd.admin.grace string:${OCF_RESKEY_CRM_meta_notify_stop_uname}
		if [ $? -ne 0 ]; then
			ocf_log info "dbus-send --print-reply --system --dest=org.ganesha.nfsd /org/ganesha/nfsd/admin org.ganesha.nfsd.admin.grace string:${OCF_RESKEY_CRM_meta_notify_stop_uname} failed"
		fi
		;;
	esac

	return ${OCF_SUCCESS}
}

ganesha_grace_monitor()
{
	local host=$(hostname -s)

	ocf_log debug "monitor"

	attr=$(crm_attribute --query --node=${host} --name=${OCF_RESKEY_grace_active} 2> /dev/null)
        if [ $? -ne 0 ]; then
		host=$(hostname)
	        attr=$(crm_attribute --query --node=${host} --name=${OCF_RESKEY_grace_active} 2> /dev/null)
                if [ $? -ne 0 ]; then
	                ocf_log info "crm_attribute --query --node=${host} --name=${OCF_RESKEY_grace_active} failed"
                fi
        fi

	# if there is no attribute (yet), maybe it's because
	# this RA started before ganesha_mon (nfs-mon) has had
	# chance to create it. In which case we'll pretend
	# everything is okay this time around
	if [[ -z "${attr}" ]]; then
		return ${OCF_SUCCESS}
	fi

	if [[ "${attr}" = *"value=1" ]]; then
		return ${OCF_SUCCESS}
	fi

	return ${OCF_NOT_RUNNING}
}

ganesha_grace_validate()
{
	return ${OCF_SUCCESS}
}

ganesha_grace_validate

# Translate each action into the appropriate function call
case $__OCF_ACTION in
start)          ganesha_grace_start
		;;
stop)           ganesha_grace_stop
		;;
status|monitor) ganesha_grace_monitor
		;;
notify)         ganesha_grace_notify
		;;
*)              ganesha_grace_usage
		exit ${OCF_ERR_UNIMPLEMENTED}
		;;
esac

rc=$?

# The resource agent may optionally log a debug message
ocf_log debug "${OCF_RESOURCE_INSTANCE} ${__OCF_ACTION} returned $rc"
exit $rc
